Motor pump unit



April 7, 1942. R. 'r. CORNELIUS ,832-

' I MOTOR PUMP UNIT 7 Filed Jan. 9, 1939- 2 Sheets-Sheet l Fig.1.

, IIQI 65 Aprifi 7, 1942.

R. 'r. CORNELIUS 2,278,832

MOTdR PUMP UNIT 2 Sheets-Sheet 2 Filed Jan. 9, 1939 Patented Apr. 7, 1942 UNITED STATES PATENT OFFICE MOTOR PUMP UNIT Richard T. Cornelius, Minneapolis, Application January 9, 1939, Serial No. 249351 I Claims.

My invention relates to motor pump units and 7 Another object of the invention resides in constructing the pump unit with a separate housing and base and in clamping the pump diaphragm between the housing and base.

A feature of the invention resides in constructing the base with a central body portion overlying the diaphragm and in disposing within said body portion the exhaust valve of the pump.

Another object of the invention resides in constructing the base with cooling fins extending radially from and connected to said central body portion for cooling the same.

A still further object of the invention resides in constructing the housing to provide a compartment situated directly above the diaphragm.

An object of the invention resides in attaching a motor to said housing on one side of said compartment and in providing within the compartment mechanism operated by said motor for operating said diaphragm.

A feature of the invention resides in constructing the housing to provide a chamber on the other side of said compartment and directly opposite said motor.

An object of the invention resides in providing a port partly in said base and partly in said housing and extendingthrough said diaphragm for bringing said exhaust valve into communication with the chamber.

Another object of the invention resides in operating the diaphragm with a connecting rod and in providing said connecting rod with an intake valve and in further utilizing said compartment as an intake chamber for delivering air to the intake valve of the pump.

A still further object of the invention resides in providing a regulating valve situated above said compartment'and in further providing a.

port in the housing for bringing said regulating valve into communication with said chamber.

Other objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and/or described.

tor pump unit illustrating an embodiment of my inventiofi and showing a portion of the same in elevation.

Fig. 2 is an elevational on line 2-2 of Fig. 1.

Fig. 3 is a plan sectional view taken 33 of Fig. 2.

Fig. 4 is a fragmentary elevational sectional view showing the diaphragm and. exhaust valve of the unit and drawn to a larger scale.

My invention comprises a housing A which is supported on a base B. A pump mechanism C is carried by the housing and base and is operated by an electrical motor D. These various parts will now be described in detail.

The housing A consists of a horizontally positioned cylindrical wall In open at it ends. This wall has a tubular portion II, at the lowermost sectional view taken on line part thereof, and a neck l2 at the upper portion of the same. Both of these parts are open at their ends and are connected to two partitions l3 and I4 which extend completely across .the wall I0. Another partition l5 extends across thepartitions l3 and i4 and divides the space between said partitions and the neck I! into two compartments, indicated by the reference numeral l6 and I1.

The base B is constructed with a central body portion l8, which underlies the lowermost end of the tubular part I l of housing A and which is secured thereto by means of screws I9. These screws extend through the part l8 and ,are threaded into a flange 2| extending inwardly from the part II which is accurately turned to form a seat. Clamped between the flange II and the central body portion I8 is a diaphragm 22 constructed of some flexible material adapted to be reciprocated and forming'the movable element of the pump C. The diaphragm 22 forms a seal between the housing A and the base B and closes the lower end of compartment H.

The base B is constructed, as best shown in Fig. I

3, with a number of radially extending fins 23 which projectoutwardlyfrom the central body portion l8. These fins are connected together and are reinforced by means of two circumferentially extending fins 24 and 25, the fin 24 being disposed at the edge of the central body portion and the fin 25 being situated medially of the ends of the fins 23. A rim 26 is connected to the cap 44.

the outer ends of the fins 23.. The various fins 23, 24, and 25 as well as the rim 26 serve 'to radiate heat outwardly from the central body portion I6 of the base B and to cool the diaphragm 22 and other parts associated therewith. The base B is supported on a number of rubber feet 21 which are attached to bosses 28 on the rim 26 by means of screws 29. These feet hold the'base C elevated above the surface on which the motor pump unit rests.

The cylindrical wall I6 of housing A terminates at one end shortly past the tubular portion II of said housing and the neck I2. At this end motor D is attached to the housing. Motor D may be of any desired type and for this reason the construction has not been shown in detail. The motor shown is of the split-phase, single-phase alternating type and comprises a rotor 3|, mounted on a shaft 32. Themotor includes a case 33. One end of the shaft 32 is journalled in a bearing 35 received within a socket 36 formed in the partition I4 of housing A. The case 33 has an end bell 31 in which a bearing 34 is contained and in which the other end of the shaft 32 is joumalled. The case 33 and end bell 31 are securely bolted to the cylindrical end wall I6 of housing A by means of bolts 38. The rotor 3| of motor D rotates within a field core 39 mounted in case 33 and which is energized by windings 4|. A centrifugal switch 42 also forms part of the motor D.

The pump C includes the diaphragm 22, previously referred to. Overlying this diaphragm is a circular head 43. Upon theunder surface of the diaphragm is disposed a cap 44 which is secured to the-head 43 by means of screws45. By means of this construction the head 43 is securely attached to the diaphragm 22. The head 43 has secured to it a connecting rod 46 which is constructed with two spaced T-shaped bars 41 connected together intermediate their ends by means of struts 48 and 49. The upper end of these bars are connected to a split boss 56 which is bored to receive the outer race of a ball bearing means of a screw 52 which draws the two parts of the boss together and clamps the same in position. The end of the shaft 32 is threaded, as designated at 53. To this threaded end of the shaft is screwed a counterweight 54. This counterweight is constructed with a pin 55, extending outwardly therefrom, which is eccentrically arranged with reference to the shaft 32. Pin 55 receives the inner race of the ball bearing 5| which is held in position on said pin by means of a cap screw 56, screwed into said pin. Upon rotation of the shaft 32 of motor D, the connecting rod 46 is caused to reciprocate and the pump diaphragm is moved in the desired manner.

In the central body portion I8 of base B is formed a concavity 51 which, in conjunction with the diaphragm 22, provides a pressure chamber 58. An intake valve 59, formed in the head 43,

The said ball bearing is held in place by 22 into chamber 56. An unloading spring 61, acting between the structure 49 and the disc 6|, normally maintains said disc unseated from the seat 62 until the speed of the motor is suflicient to build up enough pressure in the chamber 58 to close said valve. The wall I6 of housing A, at the locality of the compartment I1, has an opening 68 formed in the same. This opening is closed by a grill 69 admitting air intothe said compartment from the exterior. The grill 69 has supported thereon by means of a flange 16 a porous filter I16. This filter prevents dirt from entering the compartment I1. I

he pump C includesan exhaust valve indicated in its entirety by the reference numeral 1|. This valve is mounted in a boss 12, formed on the underside of the central body portion I8 of housing A. This boss is threaded at 13 to receive a plug 14 having a neck 15 extending upwardly therefrom. A screw cap 89 screwed into the threads 13 and engaging the lowermost portion of boss 12 covers the plug 14. flange 16 of a tubular valve seat 11 which is received in a recess 16 in'the part of the central body portion I8 opposite the boss 12. The valve seat 11 has an opening 19 through the center of the same which communicates with an opening 6| in the body portion .I8. This latter opening is in communication with the chamber 58. A screen 62 overlies the opening 19 and valve seat 11 and prevents dirt from passing through the valve 1|. The neck 15 has mounted in it a fl apper valve disc 83 which is urged into engagement with the seat 11 by means of a compression coil spring 84. This coil spring is seated in a socket 85 in the plug 14 and normally holds the disc 83 into enand cap ,44 bring the compartment I1 into communication with the chamber 58. This valve is of the flapper type and consists of a flapper disc circles a valve opening in the head 44 which communicates with a corresponding opening 66 in the head 43. It will thus be seen that, when the disc 6I is lowered, air may pass through the openings 66 and 65 and through the diaphragm gagement with the seat 11. Air escapes from the opening 19 and through ports86 in the neck 15 and into a chamber 81 formed at the upper portion of the boss 12. A port 68 is formed partly in the central body portion I8 of base B andpartly in the neck I I of housing A and extends through the diaphragm 22, as best shown in Fig. 4. This portcommunicates with the chamber 81.

The wall I6 of housing A projects outwardly beyond the neck I2 and tubular portion I I at the end thereof opposite the motor D. To this end of the housing is attached, by means of screws 9|,

an end bell 92. End bell 92 forms in conjunction with the wall I6 and with the partition I3 which extends completely across the wall III, a chamber indicated by the reference numeral 93. This chamber serves as a storage chamber for compressed air. Inasmuch as the port 88 extends through the wall,|6, this port communicates with the chamber 93. An elbow 94 is screwed Into the wall I6 and has attached to it a hose connection 95 by means 01 which compressed air may be con-' ducted away from the chamber 93.

In the chamber I6 is mounted a pressure regulating valve 96. Since the construction of this valve does not form any feature of the instant invention, the same will not be described in detail. This valve includes a diaphragm 91 which is clamped between an annular seat 98, formed on the partition I5 and a ring I66. This diaphragm is urged downwardly through a compression coil spring 99.

This spring is seated, at one end, against a collar I6 l secured to diaphragm 91' and at its other end against a spring seat I62. A cap I64 is secured '.to the neck I2 by means of screws I 65 and closes the upper portion of the compartment I6. A screw I63 is threaded in a boss I66, formed in cap I64, and engages the spring seat I62 and serves to control the pressure Neck 15 engages the manner.

chamber communicates through a port I08 in thepartition 13 with the chamber 83 so that the diaphragm 91 is at all times subjected to the pressure in the chamber 93. The diaphragm 91 operates through suitable lever mechanism, not

' shown in detail, a mercury switch I09 (Fig. 2)

which is connected in the circuit for the motor D and serves to operate said motor when the pressure in the chamber 93 falls below normal and to de-energize the motor when the pressure rises above normal. V For determining the pressure in the chamber 93, a pressure gauge HI is utilized. This pres-, sure gauge is received within a recess H2 in the cylindrical wall- E of housing A. Said pressure gauge is provided with a pipe connection H3 which is screwed into the housing A and which communicates through a port HQ with the chamber ii'ii. Chamber I01 being in communication with chamber 98 through port M8, the gauge iii indicates the pressure in the chamber 93.

The operation of my invention is as follows:

-When the pressure in chamber 93 drops, switch it? is closed and the motor D energized. This causes the connecting rod 8 to be operated and the diaphragm 22 to be moved in the intended Movement of the diaphragm draws air in through the grill be and into compartment ii from which the air passes through the openings 66 in head 63 and $5 in cap 66 and through the valve 59 into chamber 58. As soon as the motor gains sufficient speed, flapper valve disc 6! closes and pressure builds up in chamber 58. The air compressed in this chamber passes through the passageways ti and i9 and through the valve ii.

Air on leaving this valve passes through the ports 86 into chamber 8'! and from this chamber throughport 88 and into'chamber 93. From this chambertheiair passes through the elbow 96 and hose connection 95 to the place where the same is to be used. Since the pressure regulating valve chamber it? is in communication with chamber 53 through port "it, the pressure regulating valve cs operates to open and close the switch 19 in accordance with the rise and fall of pressure within chamber 93. Pressure gauge i i, be-

ing in communication with chamber 93, indicates the pressure therein. Upon operation of the pump C heat is generated in the chamber 58. This heat is transferred largely to the central body portion I8 of base B and dissipated from the same through the various radiating fins 23, 2d, 25 and 26. Due to the fact that these fins are integral with the said body portion the heat is rapidly conducted to the same. It will be noted that the base B is spaced from the housing A and also from the surface on which the motor pump unit rests. the air is caused to rapidly circulate past the surfaces of the fins of base B and the heat is caused to be quickly dissipated. In this manner, the pump C is maintained cool and the diaphragm thereof and exhaust valve kept at a proper operating temperature.

My invention is highly advantageous in that the motor pump unit is extremely neat in appearance and compact, thereby requiring a minimum amount of space. The various parts of the pump unit are easily and suiiiciently cooled-by the base thereof whereby the pump operates at a suitable temperature. With my invention no external connections for conducting the air from one chamber-to the other are needed since ports .are formed in the various parts whereby such connections may be eliminated. All of the parts of my invention are readily accessible and may be removed for inspection and repair whenever desired. By the arrangement of the parts, as shown, a substantial pressure chamber isprovided whereby uniform pressure may be at all times procured.

Changes in the specific form of my invention,

' as herein disclosed, may be made within the By means of this construction,

scope of what is claimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

1. In a pump unit, a base, a housing carried by said base and secured thereto, a diaphragm clamped between said base and housing, said housing having a compartment directly over said diaphragm, and a chamber adjacent the same, mechanism within the compartment for operating said diaphragm, an exhaust valve in said base, a pressure regulating valve carried by said housing, a port formed partly in said base and partly in said housing, and extending through said diaphragm, said port connecting said valve with said chamber and a second port in said housing connecting said chamber with said pressure regulating valve.

2. In a motor pump unit, a base, a housin carried by said base and secured thereto, a diaphragm clamped between said base and housing, said housing having a vertically extending compartment directly over said diaphragm, a motor attached to said housing on one side of said compartment, means within said compartment operated by said motor for moving said diaphragm, means forming a chamber directly opposite said motor and on the other side of said compartment, means forming a second compartment directly above said first compartment, a pressure regulating valve within said second compartment, an exhaust valve in said base and ports in said base and housing for bringing said chamber into communication with said regulating valve and said exhaust valve.

3. In a motor pump unit, a housing providing a central compartment, 9. motor carried by said housing on one side of said compartment, means forming a pressure chamber on the other side of said compartment, a base connected to said housing and disposed below said-compartment,

a pressure regulating valve carried by said housing and disposed above said compartment said valve controlling the operation of said motor, pump means at the lowermost portion of said compartment, means within said compartment and operated by said motor for operating the pump means, and ports in said housing for bringing said chamber in communication with said pressure regulating valve and said pump means.

4. In a pump unit, a base, a housing carried by said base and secured thereto, a diaphragm clamped between said base and housing, said housing having spaced walls within the same 7 forming a compartment directly over said dia-' phragm, and a chamber adjacent. one of said walls, a motor carried by thehoiisin and having its shaft extending through-the other wall, a crank operated by the motor shaft and disposed within said compartment, a connecting rod connected to said crank and reciprocating said diaphragm, said connecting rod being disposed within said compartment, anintake valve having a passageway through said diaphragm communicating with said compartment, an inlet to said compartment, said base having a chamber opposite said compartment, and means for bringing said last named chamber into communication with said first named chamber. I

5. In a pump unit, a base, a housing carried by said base and secured thereto, a diaphragm clamped between said base and housing, said housing having a compartmentdirectly over said 10 diaphragm, and a chamber adjacent the same,

mechanism within the compartment for operat- 

